In this article, we present a comparative study into the directional sensitivity of patch‐antenna‐based strain sensors. Two linearly‐polarized (LP) patch sensors vs a circularly‐polarized (CP) patch sensor with identical configurations are demonstrated. The strain occurred in real structures is commonly uncertain, the usefulness of LP‐patch sensor becomes limited. Like the conventional strain gauges, it can only be used if the strain direction is known beforehand. Therefore, a nearly‐square CP‐patch sensor for multi‐directional strain monitoring is proposed here. In order to obtain high sensitivity, three novel strain sensing methods are proposed for strain monitoring. Multi‐directional strain sensing is achieved by a proof‐of‐concept prototype. The simulated results verified by experimental results show that high sensitivities of these three methods were achieved.

中文翻译：

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基于贴片天线的应变传感器的方向灵敏度比较研究

在本文中，我们对基于贴片天线的应变传感器的方向灵敏度进行了比较研究。演示了两个具有相同配置的线性极化（LP）贴片传感器和圆极化（CP）贴片传感器。实际结构中发生的应变通常是不确定的，LP膜片传感器的实用性受到限制。像常规应变仪一样，仅在事先知道应变方向的情况下才能使用它。因此，这里提出了一种用于多方向应变监测的近方形CP贴片传感器。为了获得高灵敏度，提出了三种新颖的应变监测方法。通过概念验证原型可以实现多方向应变传感。